JP2022190899A - Drill with protector - Google Patents

Abstract

To provide a drill with protector which can prevent an operator's Fingers and so on from getting caught in a drill bit during rotation, and has a simple structure.SOLUTION: A drill 100 with protector is a drill which includes a body part 110 and a drill bit 120, and drills an object to be drilled by rotation of the drill bit 120 around an axis, and comprises a protector 140 and a supporter 150, and a depth gauge 130. The protector 140 has a cylindrical shape of which an inner diameter is larger than an outer diameter of the drill bit 120, and is telescopically movable in an axial direction of the drill bit 120. The protector 140 is supported by the supporter 150 such that a space is provided between the protector 140 and the drill bit 120 by inserting the depth gauge 130 in a sub insertion hole of the supporter 150 and inserting the protector 140 in a main insertion hole of the supporter 150.SELECTED DRAWING: Figure 1

Description

TECHNICAL FIELD The present invention relates to a device for drilling plate material, metal, concrete, etc. More specifically, it relates to a drill with a protective body that can prevent fingers, gloves, etc. from being caught in the rotation of a drill bit. It is.

Small holes are made in concrete walls for installing hole-in anchors, through holes are made in metal plates for connecting screws, etc., and through holes are made in wooden walls for cables to pass through. or drilling a large number of small holes to split a rock mass into smaller pieces. ) may be provided with small holes or through holes. Hand-held drills are often used to form such small holes and through holes.

There are various types of hand-held drills, such as a hammer drill with an impact function and a vibration drill with a vibration function. Some are mainstream. That is, an operator holds a hand-held drill and presses the drill bit against the object to be drilled, and the drill bit is rotated by a driving device such as a motor, thereby gradually extending the small hole. .

By the way, although a worker carries out a drilling operation by holding a predetermined part (for example, a main handle or a side handle) of a hand-held drill, he/she may work near the rotating drill bit due to unforeseen circumstances or carelessness. A person's hand may reach out. In this case, fingers and work gloves (cotton gloves, leather gloves, etc.) may become entangled in the drill bit, resulting in injury to the operator and malfunction of the hand-held drill.

It is conceivable to install a protective tube that covers the periphery of the drill bit in order to prevent fingers from being caught even if the operator's hand reaches near the rotating drill bit. For example, by covering the drill bit with a metal protective tube, the drill bit is isolated from the outside so that the fingers do not touch the drill bit directly. However, as the drilling of the object to be drilled progresses, the drill bit also needs to enter the object to be drilled along with this. The drill bit cannot enter, ie, drilling cannot proceed. In addition, if the protection tube is not firmly fixed, the protection tube may come into contact with the rotating drill bit, which may result in injury to the operator or failure of the hand-held drill. .

Until now, no technology has been proposed for attaching a protective tube or the like for the purpose of preventing fingers from getting caught, but as in Patent Document 1, it is possible to reduce noise during drilling and collect chips and dust. A technique for attaching a cover to a hand-held drill was once proposed.

Published practical application No. 63-128006

If the technology disclosed in Patent Document 1 (in particular, the cover member 20) is used, the operator's fingers or the like are not caught in the rotating drill 14, and the cover member 21 can be expanded and contracted. does not interfere with drilling. However, according to this technique, in order to prevent the cover member 21 from coming into contact with the drill 14, a large number of parts are required and a complicated structure is required. That is, a cylindrical connecting member 22 is attached to one end of the cover member 21 (on the side of the casing 2), and an annular contact member 23 is attached to the other end of the cover member 21 (on the tip side of the drill 14). Furthermore, support members 24 and guide rods 25 are installed on both sides of the drill 14 to support the cover member 21 in its axial direction. A coil spring 26 is provided between.

As described above, the technique disclosed in Patent Document 1 requires a large number of parts and a complicated structure. Therefore, there are problems such as an increase in manufacturing costs, a tendency to break down, and a difficulty in repair. can point out the problem.

An object of the present invention is to solve the problems of the prior art, that is, to prevent the hands and fingers of the operator from being caught in the rotating drill bit, and furthermore, compared to the prior art such as Patent Document 1, To provide a drill with a protector having a simple structure.

The present invention provides a protective body that can accommodate a drill bit, stabilizes the position of the protective body by means of a support so that it does not come into contact with the drill bit, and utilizes the original parts of a hand-held drill (such as a depth gauge). This was done with a focus on the point that the support is attached by using the

A drill with a protective body according to the present invention includes a main body and a drill bit, and is a drill that drills an object to be drilled by rotating the drill bit around its axis. is provided. Among them, the protective body has a cylindrical shape with an inner diameter larger than the outer diameter of the drill bit and can be stretched in the axial direction of the drill bit, and the depth gauge is arranged substantially parallel (including parallel) to the axial direction of the drill bit. and attached to the main body. The protector is also arranged to accommodate the drill bit. Further, the support is formed with a main insertion hole through which the protector is inserted and a secondary insertion hole through which the depth gauge is inserted. By inserting the depth gauge through the auxiliary insertion hole of the support and inserting the protector through the main insertion hole of the support, the protector is attached to the support so as to provide a gap between the protector and the drill bit. While being supported and maintained in this state, the protective body shrinks in the axial direction of the drill bit as the drill bit penetrates into the body to be drilled by drilling.

The protective drill of the present invention may further include a dust collection tube. This dust collecting tube is attached to the main body and allows the dust caused by drilling to flow through. In this case, the support is formed with a fitting portion corresponding to the cross-sectional shape of the dust collection tube. The depth gauge is inserted through the auxiliary insertion hole of the support, the protective body is inserted through the main insertion hole of the support, and the fitting portion of the support is fitted into a part of the dust collecting cylinder, thereby providing protection. A protector is supported on the support with a space provided between the body and the drill bit.

The drill with a protector of the present invention can also be one in which a locking hole is formed in the support. This locking hole is a small hole that penetrates from the outside to the sub-insertion hole and has a thread groove on its inner peripheral surface. In this case, when the depth gauge is inserted through the auxiliary insertion hole and the protector is inserted through the main insertion hole, the support can slide in the axial direction of the drill bit. When a jig provided with a screw thread is tightened until it abuts against the depth gauge in the sub-insertion hole, the slide of the support in the axial direction of the drill bit is restricted.

In the drill with a protector of the present invention, the support may be configured to include the support body and the sub-bore. The plate-shaped support body is formed with a main insertion hole and a guide groove (long hole), and one secondary hole body is formed with a secondary insertion hole. The depth gauge is inserted through the sub-insertion hole of the sub-bore and the guide groove, and the insertion position of the depth gauge can be adjusted within the guide groove.

The protected drill of the present invention has the following effects.
(1) It is possible to prevent the hands and fingers of the operator from being caught in the rotating drill bit.
(2) Compared with the prior art such as Patent Document 1, for example, the number of parts required is small and the structure is simple, so that the manufacturing cost can be suppressed, and failures are less likely to occur, and repairs are easy.
(3) It is possible to suppress the scattering of fragments (for example, fragments of concrete) and shavings generated during drilling. and thus provide safer work.

1 is a side view schematically showing a drill with a protector according to the present invention; FIG. (a) is a side view schematically showing the protector, (b) a cross-sectional view schematically showing the protector. The front view which shows a support typically. (a) is a cross-sectional view at a position where the support is arranged, and (b) is a cross-sectional view at a position where the support is not arranged. (a) is a front view schematically showing the support in a slidable state, and (b) is a sectional view schematically showing the support in a slidable state. (a) is a figure which shows typically the support body which can adjust the position of a sub insertion hole, (a) is the front view, (b) is sectional drawing. FIG. 4 is a step diagram showing main steps when using the drill with a protector of the invention of the present application. FIG. 2 is a side view schematically showing a drill with a protective body according to the present invention having a dust collecting mechanism; The front view which shows typically the support body in which the fitting part was formed. The front view which shows typically the support body by which the fitting part was fitted by some rear dust collection cylinders. (a) is a cross-sectional view schematically showing a drill with a protective body according to the present invention having a cylindrical support, (b) is a cross-sectional view taken along line DD in (a), and (c) is in Sectional drawing of EE arrow. FIG. 4 is a step diagram showing main steps when using a protective drill having a cylindrical support;

An example of an embodiment of a drill with a protector according to the present invention will be described with reference to the drawings.

FIG. 1 is a side view schematically showing a drill 100 with a protector according to the present invention. Although this figure shows an example of using a hammer drill as the protected drill 100, the protected drill 100 of the present invention can be configured using various hand-held drills such as vibration drills. be able to.

As shown in FIG. 1, the protective drill 100 includes a main body 110, a drill bit 120, a depth gauge 130, a protective body 140, a support 150, and a dust collecting cylinder 160, which will be described later. can also Main elements constituting the drill 100 with a protector will be described in detail below.

(main body and drill bit)
The body part 110 is composed of a mechanism for rotating the drill bit 120 such as a motor and gears, and a so-called housing that accommodates these, and may be provided with a handle HD to be handled by the operator. The drill bit 120 is attached to the main body 110 and is rotated around an axis by a motor, gears, etc. in the housing, thereby drilling an object to be drilled (such as a concrete structure to be drilled). There are many. Here, the "axial direction" shown in FIG. 1 is the direction of the central axis of the drill bit 120, that is, the drilling direction. For the sake of convenience, here, as shown in FIG. 1, the side where drilling progresses (the left side in FIG. 1) is referred to as "front", and the opposite side (the right side in FIG. 1) is referred to as "rear". .

(depth gauge)
The depth gauge 130 is a rod-shaped or tubular member and is attached to the main body 110 after being arranged substantially parallel (including parallel) to the axial direction of the drill bit 120 . In FIG. 1, the upper part of the handle HD is attached so as to grip a part of the depth gauge 130, but the depth gauge 130 can be attached to the main body 110 by various methods such as directly attaching to the housing. can. This depth gauge 130 is for confirming the planned length of the hole (hereinafter referred to as "planned drilling length"). That is, when drilling with the protective drill 100, when the front end of the depth gauge 130 comes into contact with the object to be drilled, the operator recognizes that the planned drilling length has been achieved. Therefore, the distance between the front end of the drill bit 120 and the front end of the depth gauge 130 is the planned drilling length. Of course, since the planned drilling length differs each time it is used, the front end position of the depth gauge 130 can be arbitrarily adjusted. The main body 110, the drill bit 120, and the depth gauge 130 can be manufactured exclusively for the drill 100 with a protective body. You can also use it.

(Protector)
FIG. 2 is a diagram schematically showing the protector 140, (a) is a side view of the protector 140 viewed from the side (perpendicular to the axial direction of the drill bit 120), and (b) is a protection 14 is a cross-sectional view of body 140. FIG. The protector 140 is provided to prevent the operator's fingers from being caught in the rotating drill bit 120, and is a member that isolates the drill bit 120 from the external environment. Therefore, the protector 140 has a hollow cylindrical shape with an inner diameter larger than the outer diameter of the drill bit 120, and is arranged substantially parallel (including parallel) to the axial direction of the drill bit 120. After being arranged to accommodate the entire length (including the entire length), the rear end is fixed to the main body portion 110 .

By the way, as the drill 100 with a protective body is used to drill a hole, the drill bit 120 gradually penetrates into the body to be drilled. should be avoided. Therefore, the protector 140 should be configured to be contractible in the axial direction of the drill bit 120 . As the drilling progresses, the protective body 140 sandwiched between the object to be drilled and the body portion 110 gradually contracts, so that the drill bit 120 does not block the drill bit 120 without the protective body 140 acting as a barrier. It penetrates into the drilling body. On the other hand, when drilling is completed and the next drilling is started, the protective body 140 naturally (without being operated by a person) is in a normal state, that is, a state in which substantially the entire length (including the entire length) of the drill bit 120 is accommodated. It is desirable to return to Therefore, the protective body 140 may be configured to be contractible and stretchable, that is, to be stretchable (elastic structure). As a result, when the drill bit 120 is pulled out from the object to be drilled after completion of drilling, the protector 140 gradually expands to return to its normal state.

In order to make the protector 140 extendable, it is possible to adopt a so-called bellows structure as shown in FIG. 2(a). At this time, as a material for forming the protector 140, it is preferable to use a stretchable elastic material such as a synthetic resin such as chloroprene (CR) rubber. Alternatively, instead of the bellows structure, a protector 140 using a coil spring may be used. That is, the protection body 140 is formed by attaching a cloth-like member so as to cover the circumference of the coil spring. This is to ensure freedom.

As a result of the protective body 140 being arranged to accommodate the drill bit 120, the protective body 140 may come into contact with the drill bit 120 during drilling, which may cause the drill 100 with the protective body to malfunction. Therefore, the inner diameter of the protector 140 is made slightly larger than the outer diameter of the drill bit 120, and a clearance is provided between the inner surface of the protector 140 and the outer surface of the drill bit 120 as shown in FIG. Once provided, the drill bit 120 may be placed within the protector 140 .

(support)
As described above, the rear end of the protector 140 is fixed to the main body 110 and has substantially the same (including the same) axial length as the drill bit 120 . Therefore, the protective body 140 is in a so-called cantilever state, and the deflection increases as it goes forward. difficult to maintain over time. In order to eliminate such inconvenience, the drill 100 with a protector is provided with a support 150 . The support 150 secures the separation between the drill bit 120 and the protector 140 by supporting the protector 140 at an appropriate position. The cantilever state of the body 140 is eliminated, and as a result, the deflection of the protector 140 is suppressed and the separation between the drill bit 120 and the protector 140 is ensured.

In order for the support 150 to function as a fulcrum, that is, for the support 150 to support the weight of the protective body 140, the support 150 itself needs to be fixed in some way. However, if the support 150 is fixed with a complicated structure, there are problems that the manufacturing cost of the drill 100 with a protective body increases, and that failure is likely to occur and repair is difficult. Therefore, the protected drill 100 of the present invention employs the support 150 which has a simple structure and can be easily attached and detached.

FIG. 3 is a front view schematically showing the support 150. FIG. As shown in this figure, the support 150 has a generally plate-like shape and includes an insertion hole (hereinafter referred to as "main insertion hole 151") that penetrates the member and an insertion hole that similarly penetrates the member and has a smaller diameter than the main insertion hole 151. A hole (hereinafter referred to as "sub-insertion hole 152") is formed. The main through-hole 151 is through which the protector 140 is inserted, and naturally has a hole diameter slightly larger than the outer diameter of the protector 140. Similarly, the sub-through-hole 152 is through which the depth gauge 130 is inserted. The pore diameter is slightly larger than the outer diameter. Note that the support 150 can be formed using various materials such as steel or hard resin.

By inserting the depth gauge 130 into the secondary insertion hole 152 as shown in FIG. 1, the support 150 is supported (suspended) by the depth gauge 130 . Therefore, when the depth gauge 130 is inserted through the sub-insertion hole 152 while the protector 140 is inserted through the main insertion hole 151 , the protector 140 is supported (suspended) by the support 150 . In other words, the protector 140 is supported by the depth gauge 130 via the support 150 . As described above, the support 150 has a simple structure in which the main through-hole 151 and the sub-through-hole 152 are provided. , the protector 140 can be supported while securing the separation from the drill bit 120 .

A suitable number of supports 150 can be arranged according to the axial lengths of the depth gauge 130 and the protector 140, and they can be arranged at suitable intervals. For example, in FIG. 1, the supports 150 are arranged at two locations, but if the depth gauge 130 and the protector 140 are short, the support 150 can be arranged at only one location, or the depth gauge 130 and the protector 140 are long. Sometimes the supports 150 can be arranged at three or more locations. In addition, as shown in FIG. 4(a), at the position where the support 150 is arranged (the cross section taken along line AA in FIG. 1), the protector 140 is supported while the separation from the drill bit 120 is ensured. On the other hand, as shown in FIG. 4(b), at a position where the support 150 is not arranged (sectional view taken along line BB in FIG. 1), the protector 140 is slightly bent compared to the support 150 position. Sometimes it sucks. In this case, the arrangement (number of locations and intervals) of the support 150 is planned so that a certain distance (clearance) is secured between the support 150 and the drill bit 120 even if the protector 140 is bent. A pore size of 140 should be planned.

The support 150 has a main insertion hole 151 through which the protector 140 is inserted, and a secondary insertion hole 152 through which the depth gauge 130 is inserted. It can slide in parallel (including parallel) directions. In order to adjust the position of the support 150, it is preferable that the support 150 can be slid freely.

Therefore, it is preferable to provide the support 150 with a mechanism that allows the support 150 to slide and restricts the sliding (hereinafter referred to as a "slide control mechanism"). For example, as shown in FIG. 5(b), a slide control mechanism can be realized by forming locking holes 153 in the support 150 and using screws BT. This locking hole 153 penetrates from the outside (upper side in FIG. 5(b)) to the sub-insertion hole 152, and has a thread groove (female thread) on its inner peripheral surface. Then, a screw BT provided with a thread groove (male thread) is inserted into the locking hole 153 and both thread grooves are screwed together. movement is restricted. On the other hand, loosening the screw BT until it separates from the depth gauge 130 allows the support 150 to slide.

Although it was previously described that the main body 110, the drill bit 120, and the depth gauge 130 can be commercially available or leased products, the arrangement of the drill bit 120 and the depth gauge 130 (in particular, the vertical spacing shown in FIG. ) naturally varies from product to product. In other words, the arrangement of the main insertion hole 151 and the secondary insertion hole 152 of the support 150 needs to be changed for each product. It takes time and effort to select the support 150 to be used. Therefore, it is preferable to use a support 150 capable of adjusting the position of the sub-insertion hole 152 with respect to the main insertion hole 151 .

6A and 6B are diagrams schematically showing the support 150 in which the position of the sub-insertion hole 152 can be adjusted, where (a) is a front view and (b) is a cross-sectional view. The support 150 shown in this figure includes a support main body 150M and a sub-pore 150H. Of these, the support body 150M forms the main body portion of the support body 150, and is a plate-like member having a main insertion hole 151 and a guide groove 154 formed therein. An insertion hole 152 is formed. In this case, the depth gauge 130 is inserted through the sub-insertion hole 152 of the sub-bore 150H and further through the guide groove 154 of the support body 150M. Since the guide groove 154 is a so-called long hole as shown in FIG. 6A, the depth gauge 130 can be inserted at a desired position within the guide groove 154. (in particular, insertion height) can be adjusted.

The sub-hole body 150H shown in FIG. 6B is composed of a cylindrical sub-insertion hole 152 and a flange that does not pass through the guide groove 154, and is used by being arranged on both sides of the support body 150M. . That is, after aligning the guide groove 154 and the two sub-insertion holes 152, the sub-holes 150H are arranged on both sides of the support body 150M, and the depth gauge 130 is inserted through the sub-insertion holes 152 of one of the sub-holes 150H. At the same time, the depth gauge 130 that has passed through the guide groove 154 is further inserted into the secondary insertion hole 152 of the other secondary hole body 150H. Then, the position of the sub-hole body 150H is fixed so that the depth gauge 130 inserted through the sub-insertion hole 152 does not move within the guide groove 154 (vertical movement in the case of FIG. 6B). For example, in FIG. 6(b), a screw hole is provided in the flange portion of the secondary hole body 150H, and the screw BT inserted through the screw hole contacts the support body 150M (however, the portion other than the guide groove 154). By tightening, movement of the sub-hole body 150H (dropping in the case of FIG. 6(b)) is prevented. Moreover, in order to restrict the axial sliding movement of the drill bit 120, a slide control mechanism as shown in FIG.

The sub-hole body 150H shown in FIG. 6(b) has a cylindrical sub-insertion hole 152 and a flange, and is used in pairs, but not limited to this, various sub-hole bodies 150H can be used. be able to. For example, the sub-hole body 150H can be configured by a flange that does not pass through the guide groove 154 and a cylindrical sub-insertion hole 152 that penetrates the flange. In this case, the cylindrical sub-insertion holes 152 protrude from both sides of the flange. In addition to being able to slide within the groove 154 (that is, to adjust the insertion position of the depth gauge 130), there is no need to arrange the sub-bore bodies 150H on both sides of the support body 150M (that is, one sub-bore body 150H is provided). enough to use).

(Example of use)
FIG. 7 is a step diagram showing main processes when using the drill 100 with a protector of the present invention. First, the arrangement of the depth gauge 130 is adjusted so that the distance between the front end of the drill bit 120 and the front end of the depth gauge 130 is the planned drilling length. By inserting the protector 140 through the insertion hole 151 and then inserting the depth gauge 130 through the sub-insertion hole 152, the protector 140 is supported at an appropriate position (in particular, height). At this time, it is preferable to adjust the position of the support 150 while sliding it on the depth gauge 130, and fix the position of the support 150 by a slide control mechanism (for example, FIG. 5B) after the adjustment.

When the preparations up to this point are completed, the operator holds the drill 100 with a protective body, and the front end of the drill bit 120 is brought into contact with the concrete structure CO, which is the object to be drilled, so that the planned drilling position is reached. , activates power such as a motor to rotate the drill bit 120 . As the drilling progresses, the drill bit 120 gradually penetrates into the body to be drilled as shown in FIG. The drill bit 120 can be penetrated without the protector 140 acting as a barrier.

As the drilling progresses further, the front end of the depth gauge 130 finally comes into contact with the concrete structure CO as shown in FIG. 7(b). , stop the power of the motor, etc., and finish the drilling work. At this time, as a matter of course, the protector 140 shown in FIG. 7(b) contracts more than the protector 140 shown in FIG. 7(a). When the drill bit 120 is pulled out from the concrete structure CO, the protective body 140 extends to return to a state in which substantially the entire length of the drill bit 120 is accommodated, so that the next drilling operation can be smoothly performed.

(Modification 1)
When a commercially available product or a leased product is used as the drill 100 with a protective body according to the present invention, dust, dust, and fragments (hereinafter collectively referred to as "dust") generated during drilling are collected. Some have a dust collecting mechanism. In other words, the protected drill 100 of the present invention can also be provided with a dust collecting mechanism. FIG. 8 is a side view schematically showing the protected drill 100 of the present invention having a dust collecting mechanism. The dust collecting mechanism shown in FIG. 8 includes an opening AP serving as a suction port for dust generated by drilling, and a dust collecting cylinder 160 through which the dust flows. The dust collection cylinder 160 is composed of a front dust collection cylinder 162 connected to the opening AP and a rear dust collection cylinder 161 connected to the front dust collection cylinder 162. Dust sucked from the opening AP is collected at the front. It flows from the dust tube 162 to the rear dust collecting tube 161 in this order. A suction means such as a vacuum may be installed on the rear side of the rear dust collection tube 161 to more forcefully flow the dust.

When the protected drill 100 has a dust collection mechanism, the support 150 may be formed with a fitting portion 155 shown in FIG. The fitting portion 155 is a so-called missing portion cut out in a shape corresponding to the cross-sectional shape of the dust collection tube 160 (especially the rear dust collection tube 161). That is, when disposing the support 150 having the fitting portion 155 formed therein, as shown in FIG. , the fitting portion 155 may be fitted to a portion (upper portion in the figure) of the rear dust collecting tube 161 . Note that the rear dust collecting tube 161 shown in FIG. 10 has a generally trapezoidal cross-sectional shape at its upper portion. As a result of the support 150 being supported above by the depth gauge 130 and below by the rear dust collecting tube 161, the support 150 is supported more firmly, that is, the protector 140 can be supported more firmly. It is possible.

(Modification 2)
The protected drill 100 of the present invention uses an inner cylindrical support 150 (hereinafter referred to as "cylindrical support 150R") in place of the plate-like support 150 described above. You can also 11A and 11B are diagrams showing the protected drill 100 of the present invention provided with a cylindrical support 150R, where (a) is a cross-sectional view taken along the axial direction of the drill bit 120, and (b) is a FIG. 11(a) is a sectional view taken along line DD, and FIG. 11(c) is a sectional view taken along line EE in FIG. 11(a).

The cylindrical support 150R has an inner diameter larger than the outer diameter of the drill bit 120, is arranged substantially parallel (including parallel) to the axial direction of the drill bit 120, and accommodates a part of the drill bit 120. , and its rear end is fixed to the main body portion 110 . The protector 140 is attached so as to cover the outer circumference of the tubular support 150R (so that the tubular support 150R is inserted into the protector 140). That is, as shown in FIG. 11, by providing a clearance between the inner surface of the cylindrical support 150R and the outer surface of the drill bit 120, the inner surface of the protector 140 and the outer surface of the drill bit 120 are also spaced apart. A separation is provided to prevent the hands and fingers of the operator from being caught in the rotating drill bit 120 .

The cylindrical support 150R preferably has a structure in which the cross-sectional shape is not easily deformed in order to secure the separation from the drill bit 120. For example, it is preferably made of a material having considerable strength such as a steel pipe or a resin pipe. Therefore, it is difficult for the cylindrical support 150R to expand and contract (elastic deformation) like a bellows structure, and depending on the length of the cylindrical support 150R, penetration of the drill bit 120 into the object to be drilled during drilling is hindered. Sometimes. Therefore, the length of the cylindrical support 150R should be shorter than that of the protector 140. As shown in FIG. More specifically, the tubular support 150R is attached to the main body 110 so that the front end of the tubular support 150R is located on the rear side of the front end of the protector 140. As shown in FIG. In this case, the cylindrical support 150R can be used as the depth gauge 130, ie, the distance between the front end of the drill bit 120 and the front end of the cylindrical support 150R can be the planned drilling length.

When a series of preparations for drilling is completed, the operator holds the drill 100 with a protective body, and places the front end of the drill bit 120 on the concrete structure CO, which is the object to be drilled, so that the planned drilling position is reached. After contacting, the power of a motor or the like is started to rotate the drill bit 120 . As the drilling progresses, the drill bit 120 gradually penetrates into the body to be drilled as shown in FIG. The drill bit 120 can be penetrated without the protector 140 acting as a barrier.

As the drilling progresses further, the front end of the tubular support 150R finally comes into contact with the concrete structure CO as shown in FIG. After confirming that the drilling has been completed, stop the power of the motor, etc., and complete the drilling work. At this time, naturally, the protector 140 shown in FIG. 12(b) contracts more than the protector 140 shown in FIG. 12(a). When the drill bit 120 is pulled out from the concrete structure CO, the protective body 140 extends to return to a state in which substantially the entire length of the drill bit 120 is accommodated, so that the next drilling operation can be smoothly performed.

The drill with a protective body of the present invention provides a small hole in a concrete wall for installing a hole-in anchor, provides a through hole in a metal plate for inserting a connecting screw or the like, or allows a cable or the like to pass through. It can be used in various cases, such as providing a through hole in a wooden wall for this purpose, or providing a large number of small holes in order to divide rock masses into small pieces. According to the present invention, it is possible to suppress the fingers of the operator from being caught in the drill bit, and to further avoid the danger of debris or the like getting into the eye. It can be said that this is an invention that can be expected not only to be used industrially but also to make a great contribution to society.

REFERENCE SIGNS LIST 100 drill with protector of the present invention 110 main body 120 drill bit 130 depth gauge 140 protector 150 support 151 main insertion hole 152 secondary insertion hole 153 lock hole 154 guide groove 155 fitting portion 150M support body 150H secondary hole 150R cylinder shaped support 160 dust collection tube AP opening BT screw CO concrete structure HD handle

Claims (4)

A drill comprising a main body and a drill bit, wherein the drill bit can be drilled by rotating around an axis,
a protective body having a cylindrical shape with an inner diameter larger than the outer diameter of the drill bit and being extendable in the axial direction of the drill bit;
one or more supports;
a depth gauge arranged parallel or substantially parallel to the axial direction of the drill bit and attached to the main body;
the protector is arranged to accommodate the drill bit;
The support is formed with a main insertion hole through which the protector is inserted and a secondary insertion hole through which the depth gauge is inserted,
A gap is provided between the protector and the drill bit by inserting the depth gauge through the secondary insertion hole of the support and inserting the protector through the main insertion hole of the support. the protective body is supported by the support in a state of
As the drill bit penetrates into the object to be drilled by drilling, the protective body contracts in the axial direction of the drill bit,
A drill with a protective body characterized by: further comprising a dust collecting cylinder attached to the main body and through which dust caused by drilling flows;
A fitting portion corresponding to the cross-sectional shape of the dust collection tube is formed in the support,
The depth gauge is inserted through the auxiliary insertion hole of the support, the protector is inserted through the main insertion hole of the support, and the fitting portion of the support is attached to a part of the dust collection cylinder. By fitting, the protector is supported on the support with a gap provided between the protector and the drill bit.
2. The protected drill according to claim 1, wherein: The support is formed with a locking hole penetrating from the outside to the auxiliary insertion hole and having a thread groove on the inner peripheral surface thereof,
the support is slidable in the axial direction of the drill bit with the depth gauge inserted through the secondary insertion hole and the protector inserted through the main insertion hole;
By inserting a locking device having a screw thread on its outer periphery into the locking hole and tightening the locking device until the locking device comes into contact with the depth gauge in the secondary insertion hole, capable of restricting axial sliding of said drill bit on a support;
3. The drill with a protector according to claim 1 or 2, characterized in that: The support includes a plate-like support main body and a sub-hole body in which the sub-insertion hole is formed,
The support body is formed with the main insertion hole and a guide groove,
The depth gauge is inserted through the secondary insertion hole of the secondary hole and the guide groove, and the insertion position of the depth gauge is adjustable within the guide groove.
4. The protected drill according to any one of claims 1 to 3, characterized in that:

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